You are here:
SOIL WASHING TREATABILITY FOR PESTICIDE-CONTAMINATED SOIL
Citation:
Frederick, R. AND S. Krishnamurthy. SOIL WASHING TREATABILITY FOR PESTICIDE-CONTAMINATED SOIL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/427 (NTIS PB95122610).
Description:
The 1987 Record of Decision for Sand Creek Operable Unit 5 identified soil washing as the selected technology to remediate soils contaminated with high levels of organochlorine pesticides, herbicides and metals. nitial treatability tests conducted to assess the application of soil washing technology, did not effectively evaluate the removal of elevated contaminant concentrations which were found. To further evaluate the applicability of soil washing this industrial site, a second more comprehensive pilot-scale treatability test was conducted. wenty-three experimental runs were conducted over a two week period in late September 1992, using a pilot-scale soil washing device called the Volume Reduction Unit (VRU). he experimental design evaluated the effects of two wash temperatures, two pH levels, three surfactants, four surfactant concentrations, and two liquid to soil ratios on the contaminant removal efficiency of the soil washing process. ite soils from three depth classifications were used in the study. esults from the pilot-scale treatability test indicated that the VRU could achieve contaminant reduction efficiencies of 97% for heptachlor and >91% for dieldrin in the upper soil layer (surface to 1 ft. depth). esidual concentrations of heptachlor and dieldrin in the treated soil ranged from 50 ppm to <1.6 ppm and 6.8 ppm to <1.6 ppm respectively. owever, the analytical method detection limit of 1.6 ppm was not low enough to provide residual concentration data at the risk-based action levels of 0.55 ppm for heptachlor and 0.15 ppm for dieldrin.